illuminating vs inarticulate

illuminating

adj
  • Providing clarification or explanation; educational, revealing. 

  • Providing illumination or light. 

inarticulate

adj
  • not articulated in normal words. 

  • unable to speak with any clarity 

  • speechless 

  • not having joints or other articulations 

noun
  • An animal belonging to the subphylum Inarticulata. 

How often have the words illuminating and inarticulate occurred in a corpus of books? (source: Google Ngram Viewer )